We measure the time-integrated CP asymmetry in D0 → K0SK0S decays reconstructed in e+e- → c¯c events collected by the Belle and Belle II experiments. The corresponding data samples have integrated luminosities of 980 and 428 fb-1, respectively. To infer the flavor of the D0 meson, we exploit the correlation between the flavor of the reconstructed decay and the electric charges of particles reconstructed in the rest of the e+e− → c¯c event. This results in a sample which is independent from any other previously used at Belle or Belle II. The result, ACP(D0 → K0SK0S) =(1.3 ± 2.0 ± 0.2)%, where the first uncertainty is statistical and the second systematic, is consistent with previous determinations and with CP symmetry.

Measurement of the time-integrated CP asymmetry in D0 → K0SK0S decays using opposite-side flavor tagging at Belle and Belle II

Antonioli C.;Gaz A.;Lin S.;Stroili R.;
2025

Abstract

We measure the time-integrated CP asymmetry in D0 → K0SK0S decays reconstructed in e+e- → c¯c events collected by the Belle and Belle II experiments. The corresponding data samples have integrated luminosities of 980 and 428 fb-1, respectively. To infer the flavor of the D0 meson, we exploit the correlation between the flavor of the reconstructed decay and the electric charges of particles reconstructed in the rest of the e+e− → c¯c event. This results in a sample which is independent from any other previously used at Belle or Belle II. The result, ACP(D0 → K0SK0S) =(1.3 ± 2.0 ± 0.2)%, where the first uncertainty is statistical and the second systematic, is consistent with previous determinations and with CP symmetry.
2025
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3573219
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